Article ID: 113664, created on Apr 10, 2012, last review on Jun 17, 2016

  • Applies to:
  • Plesk for Linux/Unix

Additional Information

This article is for Parallels Plesk versions 10.4 and later.

For earlier versions, see this article:

How to recreate mail handlers in Parallels Plesk 10.3 and earlier versions


  1. The following error is found in /usr/local/psa/var/log/maillog:

    postfix/smtpd[31821]: NOQUEUE: milter-reject: CONNECT from unknown[IP]: 451 4.7.1 Service unavailable - try again later; proto=SMTP
  2. There is a suspected issue with mail handlers. How can they be recreated?

  3. Nothing appears in the /usr/local/psa/handlers directory.


Since Plesk 10.4, mail handlers are stored in the SQLite database file /var/lib/plesk/mail/handlers/handlers.db.


To check if mail handlers exist on your server:

    # /usr/local/psa/admin/sbin/mail_handlers_control --list

You can even temporarily enable 'SpamAssassin' or 'DrWeb' and send an email to a mailbox on your server (locally):

    server4:~# mail server4@domain.tld
    Subject: test

Then, examine the maillog to see if the mail handlers are executed:

    # tail /usr/local/psa/var/log/maillog | grep qmail-queue-handlers
    Mar 29 09:32:23 server4 qmail-queue-handlers...


If you still need to recreate mail handlers:

  1. Run mchk to regenerate mail handlers:

    # /usr/local/psa/admin/sbin/mchk --with-spam
    ==> Checking for: mailsrv_conf_init... ok
    ==> Checking for: mail_handlers_init... ok
    ==> Checking for: mailsrv_entities_dump... ok
    ==> Checking for: mail_admin_aliases... ok
    ==> Checking for: mail_auth_dump... ok
    ==> Checking for: mailman_lists_dump... ok
    ==> Checking for: mail_kav8_restore... ok
    ==> Checking for: mail_responder_restore... ok
    ==> Checking for: mail_spam_restore... ok
    ==> Checking for: mail_grey_restore... ok
    ==> Checking for: mail_mailbox_restore... ok
    ==> Checking for: mail_spf_restore... ok
    ==> Checking for: mail_dk_restore... ok
    ==> Checking for: mail_drweb_restore... ok
  2. Check that the mail handlers were created and that they are applied as described in the Diagnostics section above.

Search Words


timed out while sending end of data -- message may be sent more than once

451 4.7.1 Service unavailable

NOQUEUE: milter-reject

mail getting rejected "no mailbox here by that name."

timeout postfix

SMFIC_BODYEOB reply packet header


5.7.0 The message could not be sent. You are not allowed to use sendmail utility

スパムフィルタ 個々のアカウントで 無効に設定 .Spamに振り分け


timed out while sending end of

IP addresses for mail service

starter: submitter[18034] exited normally

Blackhole Mail

4.7.1 Service unavailable - try again later

recreate handlers

mchk account email

recreate mail handlers

451 4.7.1 Service unavailable - try again later

Unable to parse e-mail address

trouble injecting bounce message

mail handlers

email issue

56797cefb1efc9130f7c48a7d1db0f0c a914db3fdc7a53ddcfd1b2db8f5a1b9c 29d1e90fd304f01e6420fbe60f66f838

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